--- /dev/null
+/*
+ * event-expr.c
+ *
+ * Copyright (C) 2020 Philippe Proulx <pproulx@efficios.com>
+ *
+ * SPDX-License-Identifier: LGPL-2.1-only
+ *
+ */
+
+#define _LGPL_SOURCE
+#include <stddef.h>
+
+#include <common/bytecode/bytecode.h>
+#include <common/error.h>
+#include <common/macros.h>
+#include <common/mi-lttng.h>
+#include <lttng/event-expr-internal.h>
+#include <lttng/event-expr.h>
+#include <stdio.h>
+
+enum lttng_event_expr_type lttng_event_expr_get_type(
+ const struct lttng_event_expr *expr)
+{
+ enum lttng_event_expr_type type;
+
+ if (!expr) {
+ type = LTTNG_EVENT_EXPR_TYPE_INVALID;
+ goto end;
+ }
+
+ type = expr->type;
+
+end:
+ return type;
+}
+
+static
+struct lttng_event_expr *create_empty_expr(enum lttng_event_expr_type type,
+ size_t size)
+{
+ struct lttng_event_expr *expr;
+
+ expr = (lttng_event_expr *) zmalloc(size);
+ if (!expr) {
+ goto end;
+ }
+
+ expr->type = type;
+
+end:
+ return expr;
+}
+
+static
+struct lttng_event_expr_field *create_field_event_expr(
+ enum lttng_event_expr_type type,
+ const char *name)
+{
+ struct lttng_event_expr_field *expr =
+ container_of(
+ create_empty_expr(type, sizeof(*expr)),
+ struct lttng_event_expr_field, parent);
+
+ if (!expr) {
+ goto error;
+ }
+
+ LTTNG_ASSERT(name);
+ expr->name = strdup(name);
+ if (!expr->name) {
+ goto error;
+ }
+
+ goto end;
+
+error:
+ if (expr) {
+ lttng_event_expr_destroy(&expr->parent);
+ }
+ expr = NULL;
+
+end:
+ return expr;
+}
+
+struct lttng_event_expr *lttng_event_expr_event_payload_field_create(
+ const char *field_name)
+{
+ struct lttng_event_expr *expr = NULL;
+
+ if (!field_name) {
+ goto end;
+ }
+
+ expr = &create_field_event_expr(
+ LTTNG_EVENT_EXPR_TYPE_EVENT_PAYLOAD_FIELD,
+ field_name)->parent;
+
+end:
+ return expr;
+}
+
+struct lttng_event_expr *lttng_event_expr_channel_context_field_create(
+ const char *field_name)
+{
+ struct lttng_event_expr *expr = NULL;
+
+ if (!field_name) {
+ goto end;
+ }
+
+ expr = &create_field_event_expr(
+ LTTNG_EVENT_EXPR_TYPE_CHANNEL_CONTEXT_FIELD,
+ field_name)->parent;
+
+end:
+ return expr;
+}
+
+struct lttng_event_expr *lttng_event_expr_app_specific_context_field_create(
+ const char *provider_name, const char *type_name)
+{
+ struct lttng_event_expr_app_specific_context_field *expr = NULL;
+ struct lttng_event_expr *ret_parent_expr;
+
+ if (!type_name || !provider_name) {
+ goto error;
+ }
+
+ expr = container_of(create_empty_expr(
+ LTTNG_EVENT_EXPR_TYPE_APP_SPECIFIC_CONTEXT_FIELD,
+ sizeof(*expr)),
+ struct lttng_event_expr_app_specific_context_field,
+ parent);
+ if (!expr) {
+ goto error;
+ }
+
+ expr->provider_name = strdup(provider_name);
+ if (!expr->provider_name) {
+ goto error;
+ }
+
+ expr->type_name = strdup(type_name);
+ if (!expr->type_name) {
+ goto error;
+ }
+
+ ret_parent_expr = &expr->parent;
+ goto end;
+
+error:
+ if (expr) {
+ lttng_event_expr_destroy(&expr->parent);
+ }
+ ret_parent_expr = NULL;
+
+end:
+ return ret_parent_expr;
+}
+
+struct lttng_event_expr *lttng_event_expr_array_field_element_create(
+ struct lttng_event_expr *array_field_expr,
+ unsigned int index)
+{
+ struct lttng_event_expr_array_field_element *expr = NULL;
+ struct lttng_event_expr *ret_parent_expr;
+
+ /* The parent array field expression must be an l-value */
+ if (!array_field_expr ||
+ !lttng_event_expr_is_lvalue(array_field_expr)) {
+ goto error;
+ }
+
+ expr = container_of(create_empty_expr(
+ LTTNG_EVENT_EXPR_TYPE_ARRAY_FIELD_ELEMENT,
+ sizeof(*expr)),
+ struct lttng_event_expr_array_field_element,
+ parent);
+ if (!expr) {
+ goto error;
+ }
+
+ expr->array_field_expr = array_field_expr;
+ expr->index = index;
+ ret_parent_expr = &expr->parent;
+ goto end;
+
+error:
+ ret_parent_expr = NULL;
+
+end:
+ return ret_parent_expr;
+}
+
+const char *lttng_event_expr_event_payload_field_get_name(
+ const struct lttng_event_expr *expr)
+{
+ const char *ret = NULL;
+
+ if (!expr || expr->type != LTTNG_EVENT_EXPR_TYPE_EVENT_PAYLOAD_FIELD) {
+ goto end;
+ }
+
+ ret = container_of(expr,
+ const struct lttng_event_expr_field, parent)->name;
+
+end:
+ return ret;
+}
+
+const char *lttng_event_expr_channel_context_field_get_name(
+ const struct lttng_event_expr *expr)
+{
+ const char *ret = NULL;
+
+ if (!expr || expr->type != LTTNG_EVENT_EXPR_TYPE_CHANNEL_CONTEXT_FIELD) {
+ goto end;
+ }
+
+ ret = container_of(expr,
+ const struct lttng_event_expr_field, parent)->name;
+
+end:
+ return ret;
+}
+
+const char *lttng_event_expr_app_specific_context_field_get_provider_name(
+ const struct lttng_event_expr *expr)
+{
+ const char *ret = NULL;
+
+ if (!expr || expr->type != LTTNG_EVENT_EXPR_TYPE_APP_SPECIFIC_CONTEXT_FIELD) {
+ goto end;
+ }
+
+ ret = container_of(expr,
+ const struct lttng_event_expr_app_specific_context_field,
+ parent)->provider_name;
+
+end:
+ return ret;
+}
+
+const char *lttng_event_expr_app_specific_context_field_get_type_name(
+ const struct lttng_event_expr *expr)
+{
+ const char *ret = NULL;
+
+ if (!expr || expr->type != LTTNG_EVENT_EXPR_TYPE_APP_SPECIFIC_CONTEXT_FIELD) {
+ goto end;
+ }
+
+ ret = container_of(expr,
+ const struct lttng_event_expr_app_specific_context_field,
+ parent)->type_name;
+
+end:
+ return ret;
+}
+
+const struct lttng_event_expr *
+lttng_event_expr_array_field_element_get_parent_expr(
+ const struct lttng_event_expr *expr)
+{
+ const struct lttng_event_expr *ret = NULL;
+
+ if (!expr || expr->type != LTTNG_EVENT_EXPR_TYPE_ARRAY_FIELD_ELEMENT) {
+ goto end;
+ }
+
+ ret = container_of(expr,
+ const struct lttng_event_expr_array_field_element,
+ parent)->array_field_expr;
+
+end:
+ return ret;
+}
+
+enum lttng_event_expr_status lttng_event_expr_array_field_element_get_index(
+ const struct lttng_event_expr *expr, unsigned int *index)
+{
+ enum lttng_event_expr_status ret = LTTNG_EVENT_EXPR_STATUS_OK;
+
+ if (!expr || expr->type != LTTNG_EVENT_EXPR_TYPE_ARRAY_FIELD_ELEMENT ||
+ !index) {
+ ret = LTTNG_EVENT_EXPR_STATUS_INVALID;
+ goto end;
+ }
+
+ *index = container_of(expr,
+ const struct lttng_event_expr_array_field_element,
+ parent)->index;
+
+end:
+ return ret;
+}
+
+bool lttng_event_expr_is_equal(const struct lttng_event_expr *expr_a,
+ const struct lttng_event_expr *expr_b)
+{
+ bool is_equal = true;
+
+ if (!expr_a && !expr_b) {
+ /* Both `NULL`: equal */
+ goto end;
+ }
+
+ if (!expr_a || !expr_b) {
+ /* Only one `NULL`: not equal */
+ goto not_equal;
+ }
+
+ if (expr_a->type != expr_b->type) {
+ /* Different types: not equal */
+ goto not_equal;
+ }
+
+ switch (expr_a->type) {
+ case LTTNG_EVENT_EXPR_TYPE_EVENT_PAYLOAD_FIELD:
+ case LTTNG_EVENT_EXPR_TYPE_CHANNEL_CONTEXT_FIELD:
+ {
+ const struct lttng_event_expr_field *field_expr_a =
+ container_of(expr_a,
+ const struct lttng_event_expr_field,
+ parent);
+ const struct lttng_event_expr_field *field_expr_b =
+ container_of(expr_b,
+ const struct lttng_event_expr_field,
+ parent);
+
+ if (strcmp(field_expr_a->name, field_expr_b->name) != 0) {
+ goto not_equal;
+ }
+
+ break;
+ }
+ case LTTNG_EVENT_EXPR_TYPE_APP_SPECIFIC_CONTEXT_FIELD:
+ {
+ const struct lttng_event_expr_app_specific_context_field *field_expr_a =
+ container_of(expr_a,
+ const struct lttng_event_expr_app_specific_context_field,
+ parent);
+ const struct lttng_event_expr_app_specific_context_field *field_expr_b =
+ container_of(expr_b,
+ const struct lttng_event_expr_app_specific_context_field,
+ parent);
+
+ if (strcmp(field_expr_a->provider_name,
+ field_expr_b->provider_name) != 0) {
+ goto not_equal;
+ }
+
+ if (strcmp(field_expr_a->type_name,
+ field_expr_b->type_name) != 0) {
+ goto not_equal;
+ }
+
+ break;
+ }
+ case LTTNG_EVENT_EXPR_TYPE_ARRAY_FIELD_ELEMENT:
+ {
+ const struct lttng_event_expr_array_field_element *elem_expr_a =
+ container_of(expr_a,
+ const struct lttng_event_expr_array_field_element,
+ parent);
+ const struct lttng_event_expr_array_field_element *elem_expr_b =
+ container_of(expr_b,
+ const struct lttng_event_expr_array_field_element,
+ parent);
+
+ if (!lttng_event_expr_is_equal(elem_expr_a->array_field_expr,
+ elem_expr_b->array_field_expr)) {
+ goto not_equal;
+ }
+
+ if (elem_expr_a->index != elem_expr_b->index) {
+ goto not_equal;
+ }
+
+ break;
+ }
+ default:
+ break;
+ }
+
+ goto end;
+
+not_equal:
+ is_equal = false;
+
+end:
+ return is_equal;
+}
+
+void lttng_event_expr_destroy(struct lttng_event_expr *expr)
+{
+ if (!expr) {
+ goto end;
+ }
+
+ switch (expr->type) {
+ case LTTNG_EVENT_EXPR_TYPE_EVENT_PAYLOAD_FIELD:
+ case LTTNG_EVENT_EXPR_TYPE_CHANNEL_CONTEXT_FIELD:
+ {
+ struct lttng_event_expr_field *field_expr =
+ container_of(expr,
+ struct lttng_event_expr_field, parent);
+
+ free(field_expr->name);
+ break;
+ }
+ case LTTNG_EVENT_EXPR_TYPE_APP_SPECIFIC_CONTEXT_FIELD:
+ {
+ struct lttng_event_expr_app_specific_context_field *field_expr =
+ container_of(expr,
+ struct lttng_event_expr_app_specific_context_field,
+ parent);
+
+ free(field_expr->provider_name);
+ free(field_expr->type_name);
+ break;
+ }
+ case LTTNG_EVENT_EXPR_TYPE_ARRAY_FIELD_ELEMENT:
+ {
+ struct lttng_event_expr_array_field_element *elem_expr =
+ container_of(expr,
+ struct lttng_event_expr_array_field_element,
+ parent);
+
+ lttng_event_expr_destroy(elem_expr->array_field_expr);
+ break;
+ }
+ default:
+ break;
+ }
+
+ free(expr);
+
+end:
+ return;
+}
+
+static int event_expr_to_bytecode_recursive(const struct lttng_event_expr *expr,
+ struct lttng_bytecode_alloc **bytecode,
+ struct lttng_bytecode_alloc **bytecode_reloc)
+{
+ int status;
+ enum lttng_event_expr_status event_expr_status;
+
+ switch (lttng_event_expr_get_type(expr)) {
+ case LTTNG_EVENT_EXPR_TYPE_EVENT_PAYLOAD_FIELD:
+ {
+ const char *name;
+
+ status = bytecode_push_get_payload_root(bytecode);
+ if (status) {
+ ERR("Failed to get payload root from bytecode");
+ goto end;
+ }
+
+ name = lttng_event_expr_event_payload_field_get_name(expr);
+ if (!name) {
+ ERR("Failed to get payload field name from event expression");
+ status = -1;
+ goto end;
+ }
+
+ status = bytecode_push_get_symbol(
+ bytecode, bytecode_reloc, name);
+ if (status) {
+ ERR("Failed to push 'get symbol %s' in bytecode", name);
+ goto end;
+ }
+
+ break;
+ }
+ case LTTNG_EVENT_EXPR_TYPE_CHANNEL_CONTEXT_FIELD:
+ {
+ const char *name;
+
+ status = bytecode_push_get_context_root(bytecode);
+ if (status) {
+ ERR("Failed to get context root from bytecode");
+ goto end;
+ }
+
+ name = lttng_event_expr_channel_context_field_get_name(expr);
+ if (!name) {
+ ERR("Failed to get channel context field name from event expression");
+ status = -1;
+ goto end;
+ }
+
+ status = bytecode_push_get_symbol(
+ bytecode, bytecode_reloc, name);
+ if (status) {
+ ERR("Failed to push 'get symbol %s' in bytecode", name);
+ goto end;
+ }
+
+ break;
+ }
+ case LTTNG_EVENT_EXPR_TYPE_APP_SPECIFIC_CONTEXT_FIELD:
+ {
+ int ret;
+ char *name = NULL;
+ const char *provider_name, *type_name;
+
+ status = bytecode_push_get_app_context_root(bytecode);
+ if (status) {
+ ERR("Failed to get application context root from bytecode");
+ goto end;
+ }
+
+ provider_name = lttng_event_expr_app_specific_context_field_get_provider_name(
+ expr);
+ if (!provider_name) {
+ ERR("Failed to get application context provider name from event expression");
+ status = -1;
+ goto end;
+ }
+
+ type_name = lttng_event_expr_app_specific_context_field_get_type_name(
+ expr);
+ if (!type_name) {
+ ERR("Failed to get application context type name from event expression");
+ status = -1;
+ goto end;
+ }
+
+ /*
+ * Reconstitute the app context field name from its two parts.
+ */
+ ret = asprintf(&name, "%s:%s", provider_name, type_name);
+ if (ret < 0) {
+ PERROR("Failed to format application specific context: provider_name = '%s', type_name = '%s'",
+ provider_name, type_name);
+ status = -1;
+ goto end;
+ }
+
+ status = bytecode_push_get_symbol(
+ bytecode, bytecode_reloc, name);
+ free(name);
+ if (status) {
+ ERR("Failed to push 'get symbol %s:%s' in bytecode",
+ provider_name, type_name);
+ goto end;
+ }
+
+ break;
+ }
+ case LTTNG_EVENT_EXPR_TYPE_ARRAY_FIELD_ELEMENT:
+ {
+ unsigned int index;
+ const struct lttng_event_expr *parent;
+
+ parent = lttng_event_expr_array_field_element_get_parent_expr(
+ expr);
+ if (!parent) {
+ ERR("Failed to get parent expression from array event expression");
+ status = -1;
+ goto end;
+ }
+
+ status = event_expr_to_bytecode_recursive(
+ parent, bytecode, bytecode_reloc);
+ if (status) {
+ goto end;
+ }
+
+ event_expr_status =
+ lttng_event_expr_array_field_element_get_index(
+ expr, &index);
+ if (event_expr_status != LTTNG_EVENT_EXPR_STATUS_OK) {
+ ERR("Failed to get array field element index from event expression");
+ status = -1;
+ goto end;
+ }
+
+ status = bytecode_push_get_index_u64(bytecode, index);
+ if (status) {
+ ERR("Failed to push 'get index %u' in bytecode", index);
+ goto end;
+ }
+
+ break;
+ }
+ default:
+ abort();
+ }
+
+ status = 0;
+end:
+ return status;
+}
+
+int lttng_event_expr_to_bytecode(const struct lttng_event_expr *expr,
+ struct lttng_bytecode **bytecode_out)
+{
+ int status;
+ struct return_op ret_insn;
+ struct lttng_bytecode_alloc *bytecode = NULL;
+ struct lttng_bytecode_alloc *bytecode_reloc = NULL;
+
+ status = bytecode_init(&bytecode);
+ if (status) {
+ ERR("Failed to initialize bytecode");
+ goto end;
+ }
+
+ status = bytecode_init(&bytecode_reloc);
+ if (status) {
+ ERR("Failed to initialize relocation bytecode");
+ goto end;
+ }
+
+ status = event_expr_to_bytecode_recursive(
+ expr, &bytecode, &bytecode_reloc);
+ if (status) {
+ /* Errors already logged. */
+ goto end;
+ }
+
+ ret_insn.op = BYTECODE_OP_RETURN;
+ bytecode_push(&bytecode, &ret_insn, 1, sizeof(ret_insn));
+
+ /* Append symbol table to bytecode. */
+ bytecode->b.reloc_table_offset = bytecode_get_len(&bytecode->b);
+ status = bytecode_push(&bytecode, bytecode_reloc->b.data, 1,
+ bytecode_get_len(&bytecode_reloc->b));
+ if (status) {
+ ERR("Failed to push symbol table to bytecode");
+ goto end;
+ }
+
+ /* Copy the `lttng_bytecode` out of the `lttng_bytecode_alloc`. */
+ *bytecode_out = lttng_bytecode_copy(&bytecode->b);
+ if (!*bytecode_out) {
+ status = -1;
+ goto end;
+ }
+
+end:
+ if (bytecode) {
+ free(bytecode);
+ }
+
+ if (bytecode_reloc) {
+ free(bytecode_reloc);
+ }
+
+ return status;
+}
+
+static
+enum lttng_error_code lttng_event_expr_event_payload_field_mi_serialize(
+ const struct lttng_event_expr *expression,
+ struct mi_writer *writer)
+{
+ int ret;
+ enum lttng_error_code ret_code;
+ const char *name = NULL;
+
+ LTTNG_ASSERT(expression);
+ LTTNG_ASSERT(writer);
+ LTTNG_ASSERT(expression->type == LTTNG_EVENT_EXPR_TYPE_EVENT_PAYLOAD_FIELD);
+
+ name = lttng_event_expr_event_payload_field_get_name(expression);
+ LTTNG_ASSERT(name);
+
+ /* Open event expr payload field element. */
+ ret = mi_lttng_writer_open_element(
+ writer, mi_lttng_element_event_expr_payload_field);
+ if (ret) {
+ goto mi_error;
+ }
+
+ /* Name. */
+ ret = mi_lttng_writer_write_element_string(
+ writer, config_element_name, name);
+ if (ret) {
+ goto mi_error;
+ }
+
+ /* Close event expr payload field element. */
+ ret = mi_lttng_writer_close_element(writer);
+ if (ret) {
+ goto mi_error;
+ }
+
+ ret_code = LTTNG_OK;
+ goto end;
+
+mi_error:
+ ret_code = LTTNG_ERR_MI_IO_FAIL;
+end:
+ return ret_code;
+}
+
+static
+enum lttng_error_code lttng_event_expr_channel_context_field_mi_serialize(
+ const struct lttng_event_expr *expression,
+ struct mi_writer *writer)
+{
+ int ret;
+ enum lttng_error_code ret_code;
+ const char *name = NULL;
+
+ LTTNG_ASSERT(expression);
+ LTTNG_ASSERT(writer);
+ LTTNG_ASSERT(expression->type == LTTNG_EVENT_EXPR_TYPE_CHANNEL_CONTEXT_FIELD);
+
+ name = lttng_event_expr_channel_context_field_get_name(expression);
+ LTTNG_ASSERT(name);
+
+ /* Open event expr channel context field element. */
+ ret = mi_lttng_writer_open_element(writer,
+ mi_lttng_element_event_expr_channel_context_field);
+ if (ret) {
+ goto mi_error;
+ }
+
+ /* Name. */
+ ret = mi_lttng_writer_write_element_string(
+ writer, config_element_name, name);
+ if (ret) {
+ goto mi_error;
+ }
+
+ /* Close event expr channel context field element. */
+ ret = mi_lttng_writer_close_element(writer);
+ if (ret) {
+ goto mi_error;
+ }
+
+ ret_code = LTTNG_OK;
+ goto end;
+
+mi_error:
+ ret_code = LTTNG_ERR_MI_IO_FAIL;
+end:
+ return ret_code;
+}
+
+static
+enum lttng_error_code lttng_event_expr_app_specific_context_field_mi_serialize(
+ const struct lttng_event_expr *expression,
+ struct mi_writer *writer)
+{
+ int ret;
+ enum lttng_error_code ret_code;
+ const char *provider_name = NULL;
+ const char *type_name = NULL;
+
+ LTTNG_ASSERT(expression);
+ LTTNG_ASSERT(writer);
+ LTTNG_ASSERT(expression->type ==
+ LTTNG_EVENT_EXPR_TYPE_APP_SPECIFIC_CONTEXT_FIELD);
+
+ provider_name = lttng_event_expr_app_specific_context_field_get_provider_name(
+ expression);
+ LTTNG_ASSERT(provider_name);
+
+ type_name = lttng_event_expr_app_specific_context_field_get_type_name(
+ expression);
+ LTTNG_ASSERT(provider_name);
+
+ /* Open event expr app specific context field element. */
+ ret = mi_lttng_writer_open_element(writer,
+ mi_lttng_element_event_expr_app_specific_context_field);
+ if (ret) {
+ goto mi_error;
+ }
+
+ /* Provider name. */
+ ret = mi_lttng_writer_write_element_string(writer,
+ mi_lttng_element_event_expr_provider_name,
+ provider_name);
+ if (ret) {
+ goto mi_error;
+ }
+
+ /* Type name. */
+ ret = mi_lttng_writer_write_element_string(writer,
+ mi_lttng_element_event_expr_type_name, type_name);
+ if (ret) {
+ goto mi_error;
+ }
+
+ /* Close event expr app specific context field element. */
+ ret = mi_lttng_writer_close_element(writer);
+ if (ret) {
+ goto mi_error;
+ }
+
+ ret_code = LTTNG_OK;
+ goto end;
+
+mi_error:
+ ret_code = LTTNG_ERR_MI_IO_FAIL;
+end:
+ return ret_code;
+}
+
+static
+enum lttng_error_code lttng_event_expr_array_field_element_mi_serialize(
+ const struct lttng_event_expr *expression,
+ struct mi_writer *writer)
+{
+ int ret;
+ enum lttng_error_code ret_code;
+ enum lttng_event_expr_status status;
+ const struct lttng_event_expr *parent_expr = NULL;
+ unsigned int index;
+
+ LTTNG_ASSERT(expression);
+ LTTNG_ASSERT(writer);
+ LTTNG_ASSERT(expression->type == LTTNG_EVENT_EXPR_TYPE_ARRAY_FIELD_ELEMENT);
+
+ status = lttng_event_expr_array_field_element_get_index(
+ expression, &index);
+ LTTNG_ASSERT(status == LTTNG_EVENT_EXPR_STATUS_OK);
+
+ parent_expr = lttng_event_expr_array_field_element_get_parent_expr(
+ expression);
+ LTTNG_ASSERT(parent_expr != NULL);
+
+ /* Open event expr array field element. */
+ ret = mi_lttng_writer_open_element(writer,
+ mi_lttng_element_event_expr_array_field_element);
+ if (ret) {
+ goto mi_error;
+ }
+
+ /* Index. */
+ ret = mi_lttng_writer_write_element_unsigned_int(
+ writer, mi_lttng_element_event_expr_index, index);
+ if (ret) {
+ goto mi_error;
+ }
+
+ /* Parent expression. */
+ ret_code = lttng_event_expr_mi_serialize(parent_expr, writer);
+ if (ret_code != LTTNG_OK) {
+ goto end;
+ }
+
+ /* Close event expr array field element. */
+ ret = mi_lttng_writer_close_element(writer);
+ if (ret) {
+ goto mi_error;
+ }
+
+ ret_code = LTTNG_OK;
+ goto end;
+
+mi_error:
+ ret_code = LTTNG_ERR_MI_IO_FAIL;
+end:
+ return ret_code;
+}
+
+enum lttng_error_code lttng_event_expr_mi_serialize(
+ const struct lttng_event_expr *expression,
+ struct mi_writer *writer)
+{
+ int ret;
+ enum lttng_error_code ret_code;
+
+ LTTNG_ASSERT(expression);
+ LTTNG_ASSERT(writer);
+
+ ret = mi_lttng_writer_open_element(writer, mi_lttng_element_event_expr);
+ if (ret) {
+ goto mi_error;
+ }
+
+ switch (expression->type) {
+ case LTTNG_EVENT_EXPR_TYPE_EVENT_PAYLOAD_FIELD:
+ ret_code = lttng_event_expr_event_payload_field_mi_serialize(
+ expression, writer);
+ break;
+ case LTTNG_EVENT_EXPR_TYPE_CHANNEL_CONTEXT_FIELD:
+ ret_code = lttng_event_expr_channel_context_field_mi_serialize(
+ expression, writer);
+ break;
+ case LTTNG_EVENT_EXPR_TYPE_APP_SPECIFIC_CONTEXT_FIELD:
+ ret_code = lttng_event_expr_app_specific_context_field_mi_serialize(
+ expression, writer);
+ break;
+ case LTTNG_EVENT_EXPR_TYPE_ARRAY_FIELD_ELEMENT:
+ ret_code = lttng_event_expr_array_field_element_mi_serialize(
+ expression, writer);
+ break;
+ default:
+ abort();
+ }
+
+ if (ret_code != LTTNG_OK) {
+ goto end;
+ }
+
+ ret = mi_lttng_writer_close_element(writer);
+ if (ret) {
+ goto mi_error;
+ }
+
+ ret_code = LTTNG_OK;
+ goto end;
+
+mi_error:
+ ret_code = LTTNG_ERR_MI_IO_FAIL;
+
+end:
+ return ret_code;
+}
projects / lttng-tools.git / blobdiff